Performance of Seven Land Surface Schemes in the WRFv4.3 Model for Simulating Precipitation in the Record‐Breaking Meiyu Season Over the Yangtze–Huaihe River Valley in China

Abstract

China experiences some of the heaviest rainstorms among the countries in East Asia. Flood disasters caused by rainstorms occur frequently every few years, and one of the areas affected most severely by floods is the Yangtze-Huaihe river valley (YHRV), where about 40% of the total flood disasters in China occur (Huang et al., 2021;Wu et al., 2021). In particular, flood disasters often occur in the Meiyu season, which usually lasts for two to 3 weeks in June and July each year.A long Meiyu period can lead to flood disasters. In particular, the Meiyu season during 2020 in YHRV was the worst since 1961, where it was mainly characterized by the longest duration of precipitation lasting from early-June to mid-July, with frequent heavy rainstorms that caused severe flooding and deaths in China. According to statistics from the Department of Emergency Management, the floods during the record-breaking Meiyu season in 2020 affected 54.81 million people, where 158 people were dead or missing, and the affected area of crops was